George,
I just came back from checking on my lake. The siphon system is working beautifully. Thus far it has handled all the rain since filling up in mid January. I catch about 1 foot rise for every 1 inch of runoff rain, there is two feet of freeboard between the drain and the emergency spillway...thus far no water has gone over the spillway.
Just for fun I capped off the siphon breaker pipe today - WOW - the water really starts to excellerate out of the end of the drain pipe. I dont know how much water is being moved through the pipe but it is a lot of fun to watch.
Sandbox, Im in NW Anderson County.
Thus far I know what drought and excessive rain years are like...I wonder what its like on a normal year?
: )